Feeling the Weight of My First Ramadan as a New Revert

Assalamualaikum dear brothers and sisters. I've been Muslim for about 7 months, and this Ramadan has been my first experience with fasting. I'm the only Muslim in my family, so I've been navigating this journey alone. I managed to fast for the first few days, around 4 or 5, but then I found myself breaking my fast too early or skipping it altogether-may Allah forgive me. To be honest, I started feeling lightheaded and extremely tired. I ended up sleeping through most of the day, even missing my university classes because I had no energy. I've also lost weight and now weigh only around 38 kilos, which has left me looking and feeling quite unhealthy. Maybe it's because my body isn't used to fasting yet, since I've never done it before. I really want to make up for these missed fasts, but I feel so guilty that I've even avoided the sisters who invited me for iftar. I didn't go, and that's the reason why-I'm just ashamed of myself. I've read that during Ramadan, Shaytan is locked up, so it feels like this is all my own doing, and it makes me wonder about my iman. This guilt has even made me hesitant to pray Salah because I worry about being hypocritical. Sisters, I could really use your advice. I don't want to go astray; please tell me what I should do. Jazakallah khair for listening.